Husqvarna 543 XP Workshop Manual page 43

Basic adjustment for chain saws with ignition system (IKEDA UK-09701) and
carburettors without limiters (Walbro HD-54B)
To ensure that the engine components receive adequate lubrication (running in) the carburettor should be
set to a somewhat richer fuel mixture for the chain saw's first 3-4 running hours. This is done by adjusting
the maximum speed to 600-700 rpm less than the recommended maximum speed. Use tool 530 03 55-60
to adjust the carburettor (L- and H-needle).
Adjustment of the L-needle and T-needle.
1. Find the highest idling speed by slowly turning
the L-screw clockwise and counterclockwise.
2. Turn the T-screw until the idling speed is 3 000
rpm.
1
4
Adjustment of the H-needle.
1. Adjust the H-screw until the maximum engine
speed at full throttle is 14 500 rpm.
1
3. Repeat the procedure in 1 and 2 once again.
4. Turn the L-screw counterclockwise 0,5 of a turn.
5. Adjust the T-screw until the idling speed is 2 700
rpm.
2
L
5
0,5
14 500 rpm
Repair Instructions
3 000 rpm
2 700 rpm
43
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